Motor RCP 35/18/11 and Jazz too hot ....

[PeterM789]

Hi Freaks,

I maidened my 550 CF today, using the RCP 35/18/11 Motor (sold by Readyheli) and a Jazz 80-6-18 ESC, initially set the throttle to 75% and using the 14T pinion. The first two minutes went very well with hovering and FFF, but then the Jazz cut off (most likely because both ESC and Motor were too hot). I could not measure the temperature, but the motor was too hot to touch, the ESC was also very warm, but I didn't burn myself.

I thought one reason might be that I did not cut any holes in the canopy (I got the FG one, and I did not want to cut it ...). So for the next flight I increased the throttle to 85% and left the canopy off. After two minutes, I landed. I think the Jazz was a bit cooler, but not by much. The motor was very hot again (I could touch it for maybe 2 seconds, then it hurt).

Does anybody else have the same problems or a better experience with this motor? Right now, I am feeling that this motor is junk and I try to return it to Readyheli....

Thanks
Peter

[xodarap1]

Hi Peter,
If your gear mesh and/or belt aren't super tight, it shouldn't do that.

Does the ESC/Motor get really hot if you just run a pack through on the ground nice and easy, with the heli at zero pitch?

[mjdee14]

One person had the same problem and it was just the TCurve was too low....you might be running the motor out of the sweet spot..

Increase your TC to 85 -90 % and try it again....y9ou might just be working the motor too hard at the low rpm.

It fixed the last persons problems.....

high pitch and low rpm's don't go together well...they produce heat.

[PeterM789]

Woow, you guys are fast... Thanks.

@ xodarap1. I used the paper method to install the pinion, and it feels okay (there is a tiny bit of play in the gear). The belt is rather loose, definitely too tight.

I thought with hovering and FFF (no loops, flips, and such) that should be nice and easy. But I can try again to run the motor for a minute or two on the ground.

@mjdee14. I use the helicopter mode of the Jazz, thus running it in governor mode. again, the first try was 75%, and the 2nd try 85%. My understanding is that I should not go more than 80 to 85%, when in governor mode, otherwise the Jazz can not increase power to avoid bogging.

But while writing this, I maybe try to run the Jazz in normal mode, w/o the governor....

For those of you who have the CF canopy: Do you cut venting holes in it, if yes how many, how big and where do you cut them?

Thanks
Peter

[mjdee14]

OK...what are your TC and PC's...? That your flying in...is your zero pitch at midstick?

And what do have for max pitch?

[clayboy]

i have the same problem . having the jazz in the battery tray. moving it to the side now. 3 short blink is overheating if that is what the esc is indicating . if motor gets to hot it could b the wrong timing. did u spool up with 100% throttle and o pitch for some seconds after programming?

[xodarap1]

Thanks for trying it for a few minutes on the ground. It will be helpful to see if it gets super hot after a few minutes when the rotor isn't under load. If it does, then usually it's a hardware problem or esc setting somewhere.

As for canopy holes, I have run the z20 and z30 without any canopy holes. The z30 ran a little too warm for my taste so I drilled some small 1/8" holes in the canopy above the z20 motor and cut out a section in the canopy directly above the z30 motor. Also cut out a side section of the canopies where the esc heatsinks are. I figured it couldn't hurt anything to give everything more circulation, as heat is the enemy.

I'm running both kong power 2200's on their sides (side by side) up on the top battery mount on the CF frame instead of one up and one below. I did that so that the lower battery wouldn't block the front canopy intake air flow during fff. It seems fine with the z30 setup this way and as an added bonus, the heli actually rolls better with both batteries up on the top shelf.

*On a side note, I have already mounted (3) 2200's 3S lipos in the heli (two up on the top shelf and one down inside the chassis) and get perfect center of gravity. Does anyone know if it is possible to connect (3) 2200's to the Align 75A ESC without damaging it? If so, how would i wire it?

[PeterM789]

OK...what are your TC and PC's...? That your flying in...is your zero pitch at midstick?

And what do have for max pitch?

I am flying only in idleup, the pitch is +10/-10 and the TC (running in Governor) was a constant 75% during the first flight, 85% on the 2nd flight. Zero Pitch is at midstick.

Not sure whether I understand your question about the max pitch. I would answer it the same (+10/-10). On those first two flights I would guesstimate I used only half way of postive pitch, meaning +5 degrees.

Thanks
Peter

[michael88997]

i have two holes in the canopie for the batteries and the part above the motor is completely gone

[PeterM789]

i have the same problem . having the jazz in the battery tray. moving it to the side now. 3 short blink is overheating if that is what the esc is indicating . if motor gets to hot it could b the wrong timing. did u spool up with 100% throttle and o pitch for some seconds after programming?

No, I did not. I programmed the Jazz, w/o spooling up. Then I did spool up for only a few seconds to check whether the motor was running in the same direction. The next spoolup was with setting the TC/governor to 75%.

I did mount the Jazz on the left side. I did not check the LED after the Jazz cut off, but that is also a good hint. Will try again.

Thanks
Peter

[clayboy]

re program the esc to mode 4 and put a flat curve to 100% and start with throttle hold and 0 pitch and let it run for 10sec and then disconnect the battery and then fly and c if the motor temp is a bit lower. the esc is setting the timing for the motor on the first spool up

[Phoinix]

What is your timing setting?

[concept1]

also I would recomend a 13t pinion and raise the curve! you will need cooling holes but with the 13t pinion you should run the H/18 more efficiently. 14t it will run hot!

[istandalone]

i ran that rcp 18 motor for a while, and mine got way hot too. raising my HS helped a bit, but it was still too hot for my liking. z20a now, and it never even gets warm.

[Phoinix]

Jazz temp problem? Run it with a curve over 75% and change your gear for appropriate HS.

I just tested:

OAT = 20°C,
T jazz = 96°C,
Jazz BEC
75% flat

OAT = 17°C,
T jazz = 87°C,
Align BEC
77% flat

Running it with more power actually makes less heat. Observe the purple motor current and red jazz temperature. It goes down with more current, thus proving that theory of less HS more temperature.


http://i97.photobucket.com/albums/l236/BlenderPilot/Show%20and%20tell/Modeli/Hurricane%20550%20CF%20Build/H550CFBECfailure.jpg


It also proves that Jazz BEC kicks in when you lose seperate bec's battery. It departed the helicopter in flight (lower red line, stops during last currrent high).